I remember an article by Phil Shoemaker where a client wounded a Brown bear. He sent the client back to the cabin with the Jr. guide and had the guide bring back ani-other guide. Any how they found the bear in the brush. The guide shot it with his 375 H & H magnum. his gun jammed, Phil shot the bear with a 505 Gibbs, I don't remember how many times but the bear slid to within 10 feet of him! Definitely a fresh underwear situation. I have black bears come in my yard quite often. The most effective thing I have found is a boat horn, a can of compressed air with a horn on it. Scares them every time.